Work around a retroactive conformance bug in Swift 6.2.

The Swift 6.2 compiler emits spurious warnings about retroactive conformances
to protocols that are inherited through a protocol that is written module
qualified in the inheritance clause. Suppress the warnings by making the
inherited conformances explicit and module qualified.

Author: tshortli

CodeGeneration/Sources/generate-swift-syntax/templates/swiftsyntaxbuilder/SyntaxExpressibleByStringInterpolationConformancesFile.swift

@@ -35,7 +35,7 @@ let syntaxExpressibleByStringInterpolationConformancesFile = SourceFileSyntax(le
     DeclSyntax(
       """
       #if compiler(>=6)
-      extension \(type): Swift.ExpressibleByStringInterpolation {}
+      extension \(type): Swift.ExpressibleByStringInterpolation, Swift.ExpressibleByStringLiteral, Swift.ExpressibleByExtendedGraphemeClusterLiteral, Swift.ExpressibleByUnicodeScalarLiteral {}
       #endif
       """
     )

Sources/SwiftSyntaxBuilder/Syntax+StringInterpolation.swift

@@ -466,7 +466,9 @@ extension TokenSyntax: SyntaxExpressibleByStringInterpolation {
 #if compiler(>=6)
 // Silence warning that TokenSyntax has a retroactive conformance to `ExpressibleByStringInterpolation` through
 // `SyntaxExpressibleByStringInterpolation`.
-extension TokenSyntax: Swift.ExpressibleByStringInterpolation {}
+extension TokenSyntax: Swift.ExpressibleByStringInterpolation, Swift.ExpressibleByStringLiteral, Swift
+    .ExpressibleByExtendedGraphemeClusterLiteral, Swift.ExpressibleByUnicodeScalarLiteral
+{}
 #endif
 
 // MARK: - Trivia expressible as string
@@ -515,7 +517,9 @@ extension Trivia {
 }
 
 #if compiler(>=6)
-extension Trivia: Swift.ExpressibleByStringInterpolation {}
+extension Trivia: Swift.ExpressibleByStringInterpolation, Swift.ExpressibleByStringLiteral, Swift
+    .ExpressibleByExtendedGraphemeClusterLiteral, Swift.ExpressibleByUnicodeScalarLiteral
+{}
 #else
 extension Trivia: ExpressibleByStringInterpolation {}
 #endif